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Alassane Plea netted a hat trick for Nice, who extended their lead in Ligue 1 to four points with a win at Metz.
Paris Saint-Germain coach Unai Emery has admitted he was warned about the "very difficult" Parisian press when he moved to France.
Angel Di Maria and Edinson Cavani were woeful in PSG's draw with Marseille. At least Thiago Silva showed a welcome return to form.
Alassane Plea's hat-trick inspired Ligue 1 leaders Nice to a 4-2 win at Metz for their fourth straight win in all competitions.
Paris Saint Germain lost further ground on league leaders Nice as they were held to a goalless draw at home to Marseille in Rudi Garcia's first game.